Keyboard



FIG. 1 is a top, rear, right perspective view of an embodiment of the claimed design;

FIG. 2 is a front elevation view thereof;

FIG. 3 is a rear elevation view thereof;

FIG. 4 is a right elevation view thereof;

FIG. 5 is a left elevation view thereof;

FIG. 6 is a top plan view thereof; and,

FIG. 7 is a bottom plan view thereof.

The broken lines shown in the drawings represent unclaimed portions of the keyboard and form no part of the claimed design. 

CLAIM We claim the ornamental design for a keyboard, as shown and described. 